Suppose that
f
(
x
,
y
)
=
3
x
4
+
3
y
4
−
2
x
y
\displaystyle {f{{\left({x},{y}\right)}}}={3}{x}^{{4}}+{3}{y}^{{4}}-{2}{x}{y}
f
(
x
,
y
)
=
3
x
4
+
3
y
4
−
2
x
y
Then the minimum value of
f
\displaystyle {f}
f
is
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